The teams grab their cameras and diving gear and hit the turquoise waters of the Maldives, where rare silvertips lurk and ferocious tiger sharks circle.
Brutal currents and jellyfish stings make Japan the most challenging dive yet — but the prospect of seeing a sharknado keeps the group's spirits afloat.
The finalists duke it out in the Galápagos, a shark-rich hotspot. Can they snap a photo of an ultra rare whale shark — or will a killer get in their way?